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Pension and Other Retiree Benefits (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) yr | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of post-retirement plans not frozen to new participants | 1 |  |
Pension and post-retirement benefit obligations | $ 317.1 | $ 283.2 |
Employer contributions | 19.5 |  |
Expected contributions to defined benefit plans for 2021 | 25.0 |  |
Costs related to defined contribution plans | 6.8 | 12.4 | $ 13.3
Esselte Leitz Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unfunded Pension Plan liability | $ 167.9 | 151.5 |
Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Payment of retirement benefits, commencement age for participants | yr | 60 |  |
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Payment of retirement benefits, commencement age for participants | yr | 65 |  |
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 962.6 | 891.3 |
Pension Plan | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension and post-retirement benefit obligations | 55.5 | 53.6 |
Employer contributions | $ 4.9 | $ 5.6 |
Weighted average asset allocations | 100.00% | 100.00% |
Pension Plan | U.S. | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations | 64.00% | 56.00% |
Pension Plan | U.S. | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations | 29.00% | 33.00% |
Pension Plan | U.S. | Alternate assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations | 7.00% |  |

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